Combination wrapping



Mach 23, 1937..

B. BAUER COMBINATION WRAP? ING Filed June 12, 1933 4 Sheets-Sheet 1 runoBO'Vef (NVE NTO March 23, 1937. B BAUER 2,074,320

COMBINATION WRAPPING Filed June l2, 1933 4 Sheets-Sheet 2 Bvun BowenlNVENTO March 23, 1937. B, BAUER 2,074,320

' COMBINATION WRAPPING Filed June' 12, 195s 4 sheets-sheet 3 wwv AM /ll44 4 -Hill i March 23, 1937.

B. BAUER 2,074,320

COMBINATION WRAPPING Filed June 12, 1955 4 Sheets-Sheet 4 'Fig'.lz.

w l/l//l l E MTM.

Patented Mar. 23, 1937 genere PATENT oFF-.lcs

COMBINATION WRAPPING Bruno Bauer, Vienna, Austria Application June 12,1933,` Serial No. 675,436 In Germany March 20, 1933 7 Claims.

`This invention relates to a new and improved type of non-bendingreinforcing skeleton for Wrapped ferro-*concrete columns.

With the employment of rolled section iron '5 for the making ofnon-bending reinforcing skeletons for wrapped ferro-concrete columns theexcessive cross-sectional area of column resulting from the use ofcircular spiral wrapping has proved to be a drawback. A further drawback10 results from the fact that, when rolled iron sections are employed inany of the usual and known arrangements, the unitary cross-section ofthe column is divided up into separate portions. This subdivision notonly hampers the building of the column (during the pouring stage) butalso, as a more-serious consequence, very` considerably reduces thesupplementary `bearing strength of the concrete.

The arrangement provided by the present in- `vention, by virtue of the`particular type of wrapping reinforcement or reinforcing cage employedand owing to the particularrnanner of its application to or embodimentin the column, avoids such internal division ofthe ferro-concretecolumn. Y The total cross-sectional area of the column is also veryconsiderably diminished by this i novel-type of wrapping reinforcement.l The particular type of wrapping reinforcement provided by Vthe presentinvention lies 430 against the flanges of the reinforcing girders andsemi-circularly embraces `each of the open sides of the' latter formingthe longitudinal members `of the 4reinforcing' skeleton. By virtue ofthis arrangement of the wrapping reinforcement, the bearing concretecross-section is divided up into ltwo portions only, and the `formation,of segments adjacent the girder flanges which are difficult to pour isthereby entirely avoided. A further form 'of construction provides anangular wrapping reil40 inforcement. The angular or polygonal wrappingreinforcements heretofore known have proved unsatisfactory as comparedwith those of circular cross-section, since under the influence ofthepressure of the concrete while still in the -ll plastic state thesewrapping reinforcements are bulged outwards and caused to assume a moreor less round shape before they become capable of eiiercising anycarrying effect. In the reinforcement according to the presentinvention, this "W drawback is obviated by an arrangement for thestiffening of the corners or angles of polygonal wrapping members, sothat the outward bulging of the sides of the latter is effectivelyprevented. This stffening of the angles is preferably eifected 9.55 bymeans of the rolled section irons serving as the longitudinal members ofthe main reinforcement. The carrying concrete cross-section is thusbounded by the rigid main reinforcing members, and partly by thewrapping reinforcement.

Examples of forms of construction embodying the invention are shown inthe accompanying drawings, in which:

Figs. l, 2, 4 and 5 show a type of wrapping reinforcement which liesclosely upon the outer surface of the flanges of the rolled girdersconstituting the longitudinal reinforcing members, and which embracesthe open sides of these girders semi-circularly. Figs. l and 2 and Fig.4show in perspective a knot-point in the reinforcing skeleton in whichthe uprights are of ferro-concrete and the joists of section iron. Fig.5 is a cross-sectional view of a ferro-concrete column in which thelongitudinal reinforcing member consists of a T-girder and is providedwith the described type of wrapping reinforcement.

Fig. 3 is a cross-sectional View of a ferro-concrete column which isreinforced with an H- girder and two U-section irons. v

Figs. 6r to 9 show examples of rectangular wrapping reinforcement. Figs.6 and 7 show in perspective the knot-points in a reinforcing frameworkor skeleton for a structure comprising ferro-concrete columns and girderjoists. Figs. 8 and 9 are corresponding cross-sectional views.

Fig 10 shows in perspective, and Fig. 11 in cross-section thearrangement of semi-circular reinforcing. spirals in the open sides ofU-section r members as longitudinal reinforcing members. 30

Figs. 12 and 13 show the arrangement of rectangular reinforcing spiralsin the open sides of an H-girder, in perspective and in transversesection, respectively.

In the form of construction shown in Figs. 1 and 2 the longitudinalreinforcement is in the form of an H-girder l. This H-section girder isprovided with a wrapping 2 which lies close against the outside face ofthe flanges of the girder, and embraces semi-circularly the open sidesthereof. In the form shown in Fig. 5 the joist 1 in theform of rolledsection iron is welded directly or otherwise attached to the H-sectiongirder l. In order to insure the continuity of the wrappingreinforcement 2, a casing section in the form of a section'cfsemi-circular tubing 6 is welded on at the point of attachment of thegirder 1 where the wrapping reinforcement is interrupted. 'Ihe wrappingreinforcement 2 itself is attached to 5 CTI the girder I by adhesionwelding, and it is of no consequence for the carrying power of thewrapping reinforcement should the latter become burnt through at certainpoints of its attachment to the girder since the bearing power isexerted only by the semi-circular portions thereof.

In the form of construction shown in Fig. 2 the connection of the floorcarrying girder 1 to the reinforcing girder of the column is effected atan angle differing by 90 from that of the form shown in Fig. 1, and isin this case effected with the interposition of U-section irons 8.'I'hese U-section irons 8 also serve as the bridging pieces forpreserving the continuity of the wrapping reinforcement 2 across thepoints of intersection in the framework. The shape of these irons 8 can,of course, be adapted to that of the wrapped cross-section.

In the form of construction shown in Fig. 3 the supplementary carryingaction of the concrete in the column is insured by an arrangementwhereby the open sides of the longitudinal member I are boxed in bymeans of U-section irons I 6. By virtue of this arrangement the carryingconcrete cross-section is divided merely into two portions.

In the form shown in Fig. 4 there are employed as longitudinalreinforcing members two U-section irons I9 with their open sides facingoutwardly. In order to provide a unitary reinforcing skeleton, theseU-section irons I9 are surrounded by a wrapping 2 which lies against theflanges of the girders and embraces their open sides semi-circularly.

The wrapping reinforcement may also be in the form, for example, ofsemi-circularly bent metal sheets fastened over the open sides of thegirders. The main horizontal bearers 'I may be simply passed between thetwo girders I9, and attached thereto, for example by means of U-sectionirons 20. Themiddle portion of the cross-section is regarded asnon-carrying since, owing to the above described arrangement of the mainhorizontal bearers 'I satisfactory pouring of this middle portion isscarcely possible. The formation of hollow spaces in the concrete, onsetting, is unavoidable. The shell holding means 9 consist in this caseof suitably bent sheet metal.

Fig. 5 shows a cross-section of the form of construction shown in Figs.1 and 2, respectively, the cross-sectional shape of the column beingrectangular owing to the shape of the shell holding means. The shellholding means 9 may also be employed as a casing or falsework for thepouring of the column. l

In the forms of reinforcing skeleton shown in Figs. 6 to 9 polygonalwrapping reinforcement 2I is employed. 'Ihe form shown in Fig. 6corresponds substantially to that of Fig. 4. As longitudinal reinforcingmembers I again employ two U-section irons I9, the main horizontalbearer 'I being attached therebetween, for example by means of U-sectionirons 20. In this form of construction there is'employed a wrappingplate 22 which bridges over the interruption in the wrappingreinforcement I9 at the point of intersection of the frame members andthus preserves the continuity of the wrapping reinforcement. Thepolygonal wrapping reinforcement 2I lies close against the flanges ofthe U-section girders, and is thus stiifened to such an extent that evenwith the employment of comparatively flexible Wire for this purposethere is no possibility of outward bulging. The polygonal Wrappingreinforcement becomes therefore effective as a carrier. In calculatingthis form of construction only those two concrete sections areconsidered as carrying loads which are enclosed on three sides by theU-section girders I9 and on the fourth side by the Wrappingreinforcement 2 I. The intermediate portion of the crosssection is notconsidered as carrying any load. Fig. 8 is a cross-sectional view of theform of construction shown in Fig. 6.

The form of construction shown in Figs. 7 and 9 consists of an H-sectiongirder with polygonal wrapping reinforcement 2I for the provision of areinforcing skeleton for a ferro-concrete co1- umn. In this form ofconstruction also the wrapping reinforcement 2I may be regarded ascarrying loads, since two sides of the wrapping reinforcement are sosupported and stiifened by the flanges of the H-section girder that thetwo remaining sides may assume a carrying function without becomingbulged. The attachment of the main horizontal bearers 'I may beeffected, for example, by means of angle irons 23. The continuity of thewrapping reinforcement is preserved by the provision of a bridging plate22.

For the purpose of stiffening the polygonal wrapping reinforcements inaccordance with the present invention it is of course possible to employrolled section iron of any other shape, or to employ the same in anyother suitable arrangement, for example two U-section irons with theiropen sides facing inwardly, or four angle irons suitably braced, etc.

In the skeleton shown in Figs. 10 and 11 there are employed asreinforcing members two U- section irons I9 with their open sides facingoutwardly and between which the main horizontal bearer 1 is passed andattached, for example, by means of U-sections 20,

In this form of construction the reinforcing spirals 24 are fitted intothe open sides of the" skeleton may be carried out with particular easein this instance. After the setting up of the longitudinal mainreinforcing members I9 the main horizontal bearers 'I are attachedthereto, and a rigid framework is thus obtained. The reinforcing helices24 are made separately and attached in the finished state to the mainlongitudinal reinforcing members, for example by means of straps 25.

The reinforcing skeleton shown in Figs. 12 and 13 is erected and fittedtogether in a similar manner. In this form of construction two polygonalreinforcing helices 26 are arranged in the open sides of an H-sectiongirder I. The `concrete column reinforced and encased in this manner maybe subjected to particularly heavy strains, since the Wrappedreinforcement is rendered particularly taut and rigid owing to the factthat it lies close against the sides of the rolled section iron mainreinforcing members in the described manner.

I claim:

1. A ferro-concrete column, comprising hanged longitudinal irons, and areinforcing cage of noncircular transverse section contacting theflanges of the irons, and a concrete enclosure, the load carrying crosssection of the concrete being surrounded partly by said anges and partlyby said reinforcing cage.

2. A reinforcingy skeleton for ferroconcrete 75 constructions,comprising horizontal rolled section iron girders, Vertical concretecolumns including rigid longitudinal irons, and a reinforcing cage ofnon-circular transverse section contacting said longitudinal irons, saidreinforcing cage surrounding substantially all the concrete in thevertical column and retaining its shape at maximum loads on the column.

3. A reinforcing skeleton for ferro-concrete constructions, comprisinghorizontal rolled section iron girders, vertical concrete columnsincluding flanged longitudinal irons, and a reinforcing cage contactingthe flanges of the irons, substantially all the concrete in a columnbeing surrounded partly by said flanges and partly by the reinforcingcage, the latter retaining its shape at maximum loads on the column.

4. A reinforcing skeleton for ferro-concrete constructions, comprisinghorizontal rolled iron 20 girders, vertical concrete columns eachincluding a longitudinal iron in the path of 'a girder, a reinforcingcage on each longitudinal iron, and a member at least partly surroundinga longitudinal iron and attached to a girder.

5. A reinforcing skeleton, according to claim 4, and in which vsaid.member consists of a tube section surrounding the longitudinal iron andbridging the interruptions in the reinforcing cage.

6. A reinforcing skeleton for ferro-concrete constructions, comprisinghorizontal rolled iron girders, vertical concrete columns each includingtwo longitudinal irons between which said girders pass, reinforcingcages on said longitudinal irons, and a spacing member for two irons ofa column fastened to the horizontal girder.

7. A reinforcing skeleton for ferro-concrete constructions, comprisinghorizontal rolled iron girders and vertical concrete columns includingflanged longitudinal irons, inA which the load carrying cross-section ofthe concrete is surrounded by a reinforcing cage, constituted partly bythe longitudinal irons and partly by semicircular `coils which contactsubstantially on three sides' with the flanges of the longitudinal ironsandY surround the open carrying surfaces.

BRUNO BAUER.

